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Earnings per Common Share | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share [Abstract] |
Net Income per Common Share | Earnings per Common Share We present basic and diluted earnings per share. Basic earnings per share is calculated by dividing the net income attributable to the owners of QIAGEN N.V. by the weighted average number of common shares outstanding. Diluted earnings per share reflect the potential dilution that would occur if all “in the money” securities to issue common shares were exercised. The following schedule summarizes the information used to compute earnings per common share:
| Years ended December 31,
(in thousands, except per share data) | 2012 |  | 2011 |  | 2010
Net income attributable to the owners of QIAGEN N.V. | $ | 129,506 |  |  | $ | 96,038 |  |  | $ | 144,311 |
Weighted average number of common shares used to compute basic net income per common share | 235,582 |  |  | 233,850 |  |  | 232,635 |
Dilutive effect of stock options and restrictive stock units | 2,341 |  |  | 2,876 |  |  | 2,843 |
Dilutive effect of outstanding warrant shares | 2,823 |  |  | 2,338 |  |  | 5,005 |
Weighted average number of common shares used to compute diluted net income per common share | 240,746 |  |  | 239,064 |  |  | 240,483 |
Outstanding options and awards having no dilutive effect, not included in above calculation | 2,906 |  |  | 3,995 |  |  | 2,152 |
Outstanding warrants having no dilutive effect, not included in above calculation | 23,644 |  |  | 23,591 |  |  | 21,462 |
Basic earnings per common share attributable to the owners of QIAGEN N.V. | $ | 0.55 |  |  | $ | 0.41 |  |  | $ | 0.62 |
Diluted earnings per common share attributable to the owners of QIAGEN N.V. | $ | 0.54 |  |  | $ | 0.40 |  |  | $ | 0.60 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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